I have like 3 or 4 or maybe more than that but want to get a few parts that if I break a spring or some part stops working or gets a crack in it.
Want a good cheap complete BCG and all the lower springs. Is there a good kit or company to look at to get those?  I have found a company that has BCG in the right metal hardenness but is 59 bucks..   Is that a good deal if it is Nitride coated.

Is Anderson a good kit for the springs and pins?

I also want to get those trigger pin deals that dont let them back out. Had one do that and I did not notice it till it jammed

Damage Industries is the company you seek for all your “littles”.

Oops kit (Expo is what I use) and a spare bolt is what I keep in my range bag for peace of mind.

White Oak Armament  and JSE Surplus have all of the smalls that you seek.